The artistic direction for this game is amazing! It has a very strong Monkey Island 2 vibe to me as well - the second screenshot in particular reminds me of one of Peter Chan's original marker backgrounds for the game.
I've heard of the prototype but have yet to play it. Perhaps I'll give it a try this weekend? It's really heartwarming to see independent adventure games with such professionalism being produced in this day and age. Keep it up.